.sider{
    display: inline-block;
    width: 180px;
    background-color: rgb(21, 73, 124);
    color: #FFFFFF;
    overflow: auto;
    height: calc(100vh - 48px);
}
.routerList{
    list-style: none;
}

.routerList > li{
    line-height: 24px;
    font-size: 16px;
    color: #FFFFFF;
}
.routerList li a{
    text-decoration: none;
    color: inherit;
}
.routerList li a:hover{
    text-decoration: none;
    color: #999999;
}